[Georg Joachim Rhetikus, between Paracelsus and Copernicus].

At first the author presents the familial background of Rheticus, then his education, his friendships and scientific contacts. Rheticus was professor of university in Wittenberg and Leipzig. Most interesting were his contacts with Paracelsus and Copernicus. Last two decades of life Rheticus spent in Cracow working as a physician and mathematician. He died in Kosice.